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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804ec391961400db115dfe4cb2731358febdb25bc08a13e6d4756a8afc7e62db' 
  AND token = 'A5Guke32zfox0/DuraLfSFCvXvy4TZKUbJG1JhfgvgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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