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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af70ac88d13d5266c317a8c4445c7decba7be2e256de275b61c4e9023866db46' 
  AND token = 'GPEP62ZwGVizj5wJ47VAZAm4YKwxMvlWHvdLftaJs74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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