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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aed98d355fc2ad4a2061de384ff3414272ea0496114384dd0f6abc8458d963d' 
  AND token = 'AzINkbAV9V2agg7wpaz6xJi6qFcWEO1R67BlbqsjNr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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