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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f448f7233817e27b7ce4aa26760da1ebb8add4aa140c0e120d8eeff7da75ac' 
  AND token = '7ruVo2P7TxuRCZr7YCbSey6sOZmzE2M+VYXKRUw4h3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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