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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9af10152ec3675ea34e4fee94119f4f2801d14aca65dcb54d233418dc578fd' 
  AND token = 'xjVI+nEhs5ich/9ipDivbsjRB/D7c7bLmnN4JlVLMJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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