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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa6432267429a020f0c57c362a8ea3901496533341a0e09e464b392b5aab4d0' 
  AND token = 'kuuOCq+A2XDoJ6Qwa6zl2erilxsT5IngPRJrHmt2n2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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