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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cce3b317ed0e09f29a783b5a5e97389e9847264287f434f7ed3f844b44c66cc' 
  AND token = 'VZk9nbLo6iOXau8QRrZik+1pPv/v7fD9sH86bt46PPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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