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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0836b4fc9d677e3e0734cb0ed1c0a36ad1a9bb0c13eb6aa799e3f1fdb7dbf589' 
  AND token = 'piuhTojJkLujBe9vqBfWvzVRYae4b+JyNh0HlthIaGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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