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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169aeb50bff951cf625ab92fdb0db4345b6de896764dbf3b83d49539f5040291' 
  AND token = '0JM9kNO+JzC8PLCtUGQPQ8Tn8Pzz0o8raQW+Mbmwq90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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