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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8d5fbc5c052237ff89992ea27a20cc7951fcd3a7b7d1a98be2484fad835c67' 
  AND token = 'N+xVi3Ls28OCfXpN9nUef9DJoziAQE8deB+z+mbBQ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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