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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2eaa11a9de68fb8751daddf715cb483fe560111a4c94b6089ebff7df437ba6' 
  AND token = 'BXlVxbeHJZC62JYBIxp1UcUe2eMYoMP5NePjCzfaj8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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