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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b153f961373f0ef2c3335db8bd6034c50d9163976c05f0125ad66293c7ebbf9' 
  AND token = 'sCepmD8VN6klRKLdW8iYzBSmYzVcu0JiDM3AZ3taPF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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