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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75594aa487fa3b0b2dc876b7e49abe4decc1fdb176afcd9680b5feb6d780690' 
  AND token = '7GG8my6wTGqxBEDtznwjd6ONlxvdE6u0kOP92vK8wHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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