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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abff9a7df4e84ae0e1ee3083afc28d460d2b05b6f7d071f17b65d63414931350' 
  AND token = 'SonMhJbGJ26w0/c4k1kb48kvz7efTW30EvYC0ow/LXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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