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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b4f1f31af03a705254de4aa5b12a987025968ed5933d8392f297bfb6d71a1d' 
  AND token = 'QUnRqRZIlED0NTZw2G7rtlYrN+2EoiFY80zPET1yw28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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