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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4396430a33e304c6f870bc4ca73fae786dabb4ee27df1c24a6ba7264de33b3b4' 
  AND token = '/lLpACBdDXTmVwfER8CPB19MSYK1qm3vPgG74Oh/uL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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