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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79afccea1ee8bd85ff6dfb76820082c25e9ac5da407a63568cac5dba4d3e6aa9' 
  AND token = 'XIL9mej3rcpyQkoUbVWUe5gUq+MhuCsRtflZGmQQ4Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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