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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbccd5f70469aeeefd7722f94536d74f16e21bf968714263d76ed1ec479bc2a4' 
  AND token = 'GqNb0SOLHB8sdJVaJ1DAwx/NTMmK8e7BYAHoQDDFK18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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