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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e99a9a4dc1ea5a12765dca9e3f439a5845b0b152153895d47f604e0baf07ef3' 
  AND token = 'qsRTN4F2MJvY6e4TYgarHv95f3uMzoBpwp7en9H+Gwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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