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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1daf4aab30c6ebbeea416b0296a1cf0fcb80792963c5a5756bd41cd025223da3' 
  AND token = 'kDCvqMLgRvM/80OoCPQo+t1QBfxRuIL7LwQug7yO7jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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