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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb67615ccf8e04992bfca79125a4486b0f60950dcde83eaa7860fee213ad5267' 
  AND token = 'vPqllm8qoWhCXvpa3igChwxeNcWe3YTX4I0Gsznz+50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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