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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d5ffdba8d9f299176d4532857aeb6ffe73c7640a4550f0d7172700b9dfe047' 
  AND token = 'xTuFpkjG/4PDA4n0IqZO+ieCIJf7GRrfWE4SIK8taP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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