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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9896261acb6af5a05c5346a37a8a66bec76261ea2e13d1c2eba1d109296f9e0a' 
  AND token = 'kv0d8G/ZNJQeBGAhRtfwxBDZWfJF8DIk+bjIL+axJQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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