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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1b4cd4b04400083197de6509e28fdf7af7330ab2efec114b9d541e62945f92' 
  AND token = 'W20Ogwa3PEWNZ0/ZrIAjZPn5i4VV+6x8Axq0eyL79FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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