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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09e3063e76d341a9befe2be2ac9f8ed9cf9c9240478073f5fdde77f3d2b0e08' 
  AND token = 'YhabdMfqSDKNWAFq62DSnGf/5rrFdRLM3GGxcwhA/4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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