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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c8b044cb8e22daa43c86fc1fd290b32c5cd6c81f426410bb3f4102caeb834d' 
  AND token = 'VUxzFdpb4RhNp0iOK0Ntxn2Fpzz0ssPr9F1vU5LtVrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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