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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b012f8fb413ab36044b9ac270d14d15f38083e84c4b7485a5fb1b9a49ce932' 
  AND token = 'kCDR1kXmGQjsWEX83LTr/XR8za6MzDuA06dFgLuYZUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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