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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8c62c4e71f3c367dbc73abe25eda49717a5a6994fced54045aa449dcacd51c' 
  AND token = 'aUhP2tMxqj47FfYBXp84gLY0D05GT7vdcJyRxalu5uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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