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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f8e328e5f4964b06a8011122add9535af6117ef2ba06b55a191c2fec878d7f' 
  AND token = '79ivXOVb9ACUaAAiBDbR6xLfS1ACnSpFV3bpFHlloNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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