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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9356c8cb1494b1d9d08a323632536749534d6504ce286544ff11a0df3d04c74' 
  AND token = '6z+6UFjaS5OsSNi/dbzHrfOZzRFf3l5lsWQNtXP/fvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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