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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632e0092e6762586b34ca5501eaeaf4460631319feda86e2ceb0b60b58f5e831' 
  AND token = 'FTn2+VUOHL+eh1jAOEcUUcCuC/WCdePR5KoncXW7tQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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