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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6803ceeccab0c3709e87d77d182f1c612028233cb5f4bd30a33e2a069ebacfb' 
  AND token = 'xp5fLd6R0eys1+JIdsFEY59Js6SBQk3uGO/GuMYqNQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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