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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a64e1cc99643c06eb7ddd5a7984d5e0cce02eccd3a0ea7e6c232deddd0d28a9' 
  AND token = 'vo2S/29m62Zv6BlTio3u5eSWwV57VpkoXpaopOpFLuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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