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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93819ae174a64de05454c9b0fff33ca608816021be88ceb0b934216f2ec8f268' 
  AND token = '20Jtohkbd7YhOLVNK+yuEM0hVcQDm2Akmtrd2vJE42k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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