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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a82edaafb0b56b2cc1ed6ee0816eb352a8a76bdb7fb5b8104114f5138892ac' 
  AND token = 'klaW+3m3xoW6o83VoecWiR7D9m/6/OUErMWxgT+7HjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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