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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eae4f2358d61571d40df28181f77d485bd0ee293f4e82d95db8c82842d163c' 
  AND token = 'WZWBwOsBg09eqcZx2A5cpqstwXy9iCMRE6yT08Ec4MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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