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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0579480f024916c51209df231aba77abe0e946564cd97aa29a577dd405664c42' 
  AND token = 'o0oNdD7wbpA58/mSbeBfDY/G90QBtL3T8LuPSJmz10M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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