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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7609facc5f1d8a3ee7c8f3011f05c09d5732b0398cda58d1c7caf5cd9a87dfc9' 
  AND token = 'YxkyyN4RCT5odLNrbmQvMs9p5mJV6vRXDUZT6rdfXOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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