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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda42caa4a5bebf3b57d58a0b9d9605de5d00a4f1c1e2de9310b118e7c6a7c78' 
  AND token = 'yom3HrgKa6yOHEyiCTYr//dbIAUxfE2wAbtyAQhxXEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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