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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92a9b9af2df8578b1d22f5dad19b058725e9ba902d9f40e20a5cc6c4cd9ca37' 
  AND token = 't8Ft9yclgWrlXE2FMmmtEad6Hsmys21s1KRKIDfEK+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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