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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dced7cf0aff2de1d377315716e9bc577dff0b18a48fb3123e68a55d8095d04dc' 
  AND token = '1CKlNEs0rDiZzajmScX2UDSyxicZkixJlmhDHPXsa8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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