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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576fe5cfa1461a790fd8e3d19d422d08d06125fc1ec99faed48329f45c5948b7' 
  AND token = 'gRh78+sku4ZnaWs9Eu+MVsYN3yZuPHl2zb7KJYa8QYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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