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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4b21509b3859243092477f22e2ddfd49dab3d1a68a512177cab09df1355494' 
  AND token = 'whMEyNwoG7K7J3cHP7GcKDM1oAEfEGr9vvgz7Jc33nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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