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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6de094776474760b0295584ffa424e57bac0fc62a2bcf43e565d07d7c1ed572' 
  AND token = 'Iubi13i9eav9J2w8Ct/egKeilvyqbDUTuC56OpR14eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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