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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97ab0a63a6450850d1e414ec86c309bc7d3a28e85513d302184bd716d85e2be' 
  AND token = 'pGvJtPdKHG+bk6Z9vd4QyucmttgVOh6C27dixjUxVKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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