SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04584aacc3b238705de848cd32552ddf6627d1fac10d2a29de9f1ffe585154f' 
  AND token = 'PvOYKXoOZhYn+sHMP1l+j/hKJD5FmLdNn05DC3ML9fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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