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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c07c448596283333271cce8e624ffdc5946caa7dc84005d862dd61be32ba053' 
  AND token = 'bAevoiXh/TNvtXWZE+cvpP48X4ib776eLS97p0+Yq2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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