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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2737e73fb3697f5d09d8d5660b0886c4c682f2cf149c1351e9e11c296b1f09' 
  AND token = 'mcBDc10A76/afkGQZ4AgCpH8+H1tSo3nfpQIlWsKpzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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