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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d80a6393adfdf9edacf24f4a3497e08b89fffae7c2cd2d8630b7743302fe837' 
  AND token = 'e0M890G+dVNGirvxMi7eZfTIq2OrkBR+NuvKJokrwO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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