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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556686d6f3da00dd7857081bcdff839f626cfa25ea8059e749e1e0fd613de09d' 
  AND token = 'r4GcKuDMRjmhPQlHb8ojtq1Xq96fDZwnqO3ZnoQABuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}