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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712e6cabf92928c837429b58fab53e059b7c615a46232b791092f78932b20862' 
  AND token = '78Z//fCdeDRE96qNJ5enNH7bSpsAOLQ29YHmeO2jjf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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