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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b44243f08773aaa403240cece7e6158f63a32e4a49ec81a40de123b2a91600' 
  AND token = '6yO5ljR/Ju4a7Bcj67J3N5qYZfkV2t2hybdM6g/y6pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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