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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9fb91325088e129c1dd50f637b28482c8b9e214b10ae1fe9617a339fa8b9ba' 
  AND token = 'PWJ7HfbivgpSSuFW6bC9NjG6/M7wCjFa4xBDWtnEw9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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