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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f133e795d5b777e057a22c5ad9ffbe9cdb674a49818d05640d925ffcf1767d' 
  AND token = 'H3EKrYxQvYNWAzbY3zp3bTU9H6FcGqiv05c00Hm2cgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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