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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcca4a17c62167489c9d6f0102f5efcb5c60f2261e81501727d199c8f657efc0' 
  AND token = 'n8rdtgETytN1pU8ooJUI9hdMVK3q9cw57ew0UsRxqgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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