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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6d2dddc12d309e83759693e977195b1e41251b5cf37850452562cca21945f0' 
  AND token = 'o/af4eNIZbeOtAOtDcdj6442VeEZCuKTsEtV/1jhJjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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